If those brahmas are @ 10 months it could be age.
A layer ration is not ideal for breeding birds. It is designed for layers in production.
Birds in the winter especially benefit from fresh greens and sunshine. Supplement with Calf Manna (you can get a small bag), give them some greens every day. Then be patient for a bit.
I know calf Manna is good for show birds for the extra protein to help feathers and makes them shinier looking but what's the plus to giving it to breeders?
Make sure they are trimmed up good, free from mites, etc.
Didn't you have soft eggs and mites not long ago?
Yes, I think last Friday I did the second dusting. I also used the air compressor to blow that crap all around the coop to get in every nook and cranny. The eggs have nice thick shells now so that's a plus.
Do what you can do in your control, and if that is not good enough, then they are not good enough.
For some removing the males and then putting them back helps.